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Rover x8 index shifting

I am interested in buying a terra trike. The rover x8 price is very appealing, but the local dealer says he won't sell any x8 rovers because he has had a lot of problems with the rear derailleur indexing right. he claims the mounting plate for the derailleur moves around causing the derailleur to move. Has anyone experienced this problem? I do not find any mention of this in any forums.

After more thought, I'd also be worried about the general competency of a shop that has enough trouble with several derailleur hangers that they honestly think there's something wrong with the model to the point of refusing to sell it. It really is brain-dead simple to install.

Either that or they're dishonest enough to lie to customers to get what they want and blame manufacturers for stuff.

Have 6500 km on mine over last year. Lots of wear and tear and hard use but a little tune up now and again solves the problem. I have a 24" rear wheel which lifts the derailleur up out of the dirt which can be important on unpaved and rough trails

Yeah, I can see people having issues with that design. It's pretty bad. The one I received actually clamps onto the fork instead of relying on the wheel, and will not move around. I'll try to find and share a photo of it later.

OK. After some more thought, the silver design isn't as horrible as I thought it was. I'm not fully convinced relying on chain tension and the skewer to hold it in place is the best approach, but it should work without any issues.

This thread is the first I'd heard of hanger design changes. Naturally I assumed that the one I got (which works fantastically) was the "new" design, especially as the external 8 had been out for a while by then. The design I got from TT in mid-2015 looks like: (cost $5 at the time)

It clamps onto the fork itself and won't move until you take it off yourself.

The truth is either design should work fine. There's no reason to avoid an x8, especially over a simple to replace $5 part.